My preferences are about 1/2 to 1 notch/niche larger. I struggled with those small (and washed-out) screens on early PDAs and handheld cell phones, and a 4" super amoled just thrills me!
After many months of pleasure with the (6") Kindle 2, I thought I was in heaven when I got the 7" Galaxy Tab, but I'm gravitating more towards 10" screens when I'm out and about now, though I was happier with the smaller bag I could use with the 7".
At the moment I'm on the recently-wooted 14" Samsung notebook that I set up as my desktop - can
not see carrying it around, though I s'pose I could if I had one of the jobs that kept you away from your desk for days at a time.
-- Ed